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<div about="/news-events/nih-research-matters/mitochondrial-dna-involved-sickle-cell-disease" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-03-16T00:00:00-04:00" class="date-display-single">March 16, 2021</span></p><div class='syndicate'><h1>Mitochondrial DNA involved in sickle cell disease </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>People with sickle cell disease have high levels of mitochondrial DNA in their blood, which may help trigger damaging inflammation.</li>
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<li>This circulating genetic material might serve as a marker to track treatments, as well as a target for future therapies.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Bundles of abnormal, segmented mitochondria">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2021/20210316-sickle-cell.jpg?itok=zixvfR-7&timestamp=1615826832 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20210316-sickle-cell.jpg?itok=4wfFJSQf&timestamp=1615826832 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2021/20210316-sickle-cell.jpg?itok=lsBpxOaD&timestamp=1615826832 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2021/20210316-sickle-cell.jpg?itok=5RSvPWaL&timestamp=1615826832 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2021/20210316-sickle-cell.jpg?itok=g9-7hEX2&timestamp=1615826832 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20210316-sickle-cell.jpg?itok=4wfFJSQf&timestamp=1615826832" alt="Bundles of abnormal, segmented mitochondria" title="Bundles of abnormal, segmented mitochondria" />
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||
</picture><span class="caption">A 3D rendering, based on electron micrographs, of mitochondria (red) inside a sickled red blood cell. </span><span class="credit">Tumburu et al., Blood</span></div>
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||
</div><p>About 100,000 people in the U.S. are living with sickle cell disease. People with the condition are born with an abnormal type of hemoglobin, the oxygen-carrying molecule in red blood cells. The abnormal hemoglobin can cause cells to bend into a fragile, crescent—or “sickle”—shape. Sickled cells can stick to blood vessel walls, causing inflammation and slowing or stopping the flow of blood.</p>
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||
<p>Blocked blood flow can cause a number of effects, including stroke, eye problems, infections, and intense episodes of pain called pain crises. Over a lifetime, organ damage can accumulate, often leading to early death.</p>
|
||
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||
<p>Researchers have been investigating what causes inflammation in sickle cell disease. Damaged cells may release many molecules that contribute to inflammation, including cell-free DNA—genetic material that spills into the bloodstream.</p>
|
||
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||
<p>A research team at NIH’s National Heart, Lung, and Blood Institute (NHLBI) led by Drs. Laxminath Tumburu and Swee Lay Thein looked into the role that cell-free circulating DNA might play in inflammation. They took blood samples from 34 people with sickle cell disease and 8 healthy volunteers. They then isolated and sequenced the cell-free DNA. Results were published on March 4, 2021, in <em>Blood</em>.</p>
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||
|
||
<p>Sequencing showed that people with sickle cell disease had much more DNA from mitochondria—the tiny structures that produce energy for cells—circulating in their blood than people without the condition. Blood samples taken during a pain crisis had higher levels of mitochondrial DNA than samples taken at other times from the same volunteers.</p>
|
||
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||
<p>The mitochondrial DNA fragments from people with sickle cell disease also had an abnormally low amount of methylation, a common type of DNA modification. Low levels of DNA methylation have previously been tied to inflammation.</p>
|
||
|
||
<p>Normally, when red blood cells mature, they lose their mitochondria. However, imaging showed that red blood cells from people with sickle cell disease kept their mitochondria after maturity. The mitochondria also appeared abnormal.</p>
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||
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||
<p>To see if high levels of mitochondrial DNA in the blood could directly trigger inflammation, the team exposed neutrophils—a type of white blood cell—from normal donors to plasma or isolated DNA from people with sickle cell disease. Mitochondrial DNA or whole plasma induced structures called neutrophil extracellular traps (NETs). NETs play an important role in helping the body fight off disease, but can also contribute to chronic inflammation.</p>
|
||
|
||
<p>Finally, the team identified the signaling pathway that triggered NET formation in neutrophils after exposure to mitochondrial DNA. They showed that the pathway could be dampened with two different drugs.</p>
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||
|
||
<p>“These study findings suggest that measuring DNA of mitochondrial origin may help us better understand its role in pain crises, destruction of red blood cells, and other inflammatory events in sickle cell disease,” Thein says. “It could also serve as a marker of disease progression and a way to measure the effectiveness of therapeutic interventions.”</p>
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||
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||
<p>The team is planning further laboratory testing of drugs that could potentially block inflammation caused by mitochondrial DNA in the blood.</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/gene-editing-corrects-sickle-cell-mutation" target="_top">Gene Editing Corrects Sickle Cell Mutation</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/sickle-cell-trait-health-concerns-army-soldiers" target="_top">Sickle Cell Trait and Health Concerns in Army Soldiers</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/stem-cell-transplant-reverses-sickle-cell-disease-adults" target="_top">Stem Cell Transplant Reverses Sickle Cell Disease in Adults </a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/study-points-potential-treatment-sickle-cell-disease" target="_top">Study Points to Potential Treatment for Sickle Cell Disease</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/common-sickle-cell-treatment-safe-babies" target="_top">Common Sickle Cell Treatment Safe for Babies</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/sickle-cell-disease-may-affect-brain-function" target="_top">Sickle Cell Disease May Affect Brain Function</a></li><li><a href="https://newsinhealth.nih.gov/2020/09/battling-bent-blood-cells" target="_top">Battling Bent Blood Cells: Progress in Sickle Cell Disease</a></li><li><a href="https://www.nhlbi.nih.gov/health-topics/sickle-cell-disease" target="_top">Sickle Cell Disease</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/33661274/">Circulating mitochondrial DNA is a pro-inflammatory DAMP in sickle cell disease.</a> Tumburu L, Ghosh-Choudhary S, Seifuddin F, Barbu EA, Yang S, Ahmad MM, Wilkins LHW, Tunc I, Sivakumar I, Nichols JS, Dagur PK, Yang S, Almeida LEF, Quezado ZM, Combs C, Lindberg EJ, Bleck CKE, Zhu J, Shet AS, Chung JH, Pirooznia M, Thein SL. <em>Blood</em>. 2021 Mar 4:blood.2020009063. doi: 10.1182/blood.2020009063. Online ahead of print. PMID: 33661274</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Heart, Lung, and Blood Institute (NHLBI).</p>
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